deploy/deploy.json

{
  "steps": [
    {
      "name": "golang",
      "entrypoint": "bash",
      "args": [
        "-c",
        "cd go && go get golang.org/x/build/maintner/maintq && cp /go/bin/maintq /workspace/maintq"
      ]
    },
    {
      "name": "debian:stretch",
      "entrypoint": "bash",
      "args": [
        "-c",
        "apt-get update && apt-get install -y ca-certificates && ./maintq list-releases | head -n 1 | sed -re 's/^.*tag_name:\"(go[0-9](\\.[0-9]+)+)\".*$/\\1/g' > /workspace/latestgo"
      ]
    },
    {
      "name": "gcr.io/cloud-builders/docker",
      "entrypoint": "bash",
      "args": [
        "-c",
        "docker build --build-arg GO_VERSION=`cat /workspace/latestgo` -t gcr.io/$PROJECT_ID/playground ."
      ]
    },
    {
      "name": "gcr.io/cloud-builders/docker",
      "args": [
        "push",
        "gcr.io/$PROJECT_ID/playground"
      ]
    },
    {
      "name": "gcr.io/cloud-builders/gcloud",
      "args": [
        "app",
        "deploy",
        "app.yaml",
        "--project=$PROJECT_ID",
        "--image-url=gcr.io/$PROJECT_ID/playground:latest"
      ]
    }
  ],
  "timeout": "1800s"
}